The Round 5 nominee was chosen ahead of thousands of others, based on his dedication and enthusiasm, to join 21 other Auskickers who will march in the grand final parade in Melbourne.
He will also play at the MCG on grand final day and present medals to the premiership players.
Marshall is now in the running to have Geelong captain and three-time premiership player Joel Selwood as his personal footy mentor in 2014, and for a $5000 NAB junior savings account.
Canning Vale club president Ray Pearse said the competition was popular among his Auskick players.
‘This award looks beyond the best player on the ground and instead emphasises the importance of being a good teammate and looking out for others,’ he said.
Every week, 180,000 children and their parents head to one of 2800 Auskick centres around the country to take part in Auskick.